What are major sites of squamous cell carcinoma?

• The majority (70%) of cutaneous squamous cell carcinoma (SCC) occurs on the head and neck, with an additional 15% found on the upper extremities • Tumors of sun-protected skin are more prevalent in black persons • These tumors carry a higher mortality risk, possibly resulting from delayed diagnosis • Bowen disease has a similar distribution, but this condition is also seen in subungual, periungual, palmar, genital, and perianal locations. Erythroplasia of Queyrat refers to Bowen disease on the glans penis